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ALSA: compress_core: Rework writes to use cumulative values
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / core / compress_offload.c
CommitLineData
b21c60a4
VK		 1/*
2 * compress_core.c - compress offload core
3 *
4 * Copyright (C) 2011 Intel Corporation
5 * Authors: Vinod Koul <vinod.koul@linux.intel.com>
6 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
26#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
27
28#include <linux/file.h>
29#include <linux/fs.h>
30#include <linux/list.h>
f0283b58 31#include <linux/math64.h>
b21c60a4
VK		 32#include <linux/mm.h>
33#include <linux/mutex.h>
34#include <linux/poll.h>
35#include <linux/slab.h>
36#include <linux/sched.h>
f0283b58 37#include <linux/types.h>
b21c60a4
VK		 38#include <linux/uio.h>
39#include <linux/uaccess.h>
40#include <linux/module.h>
41#include <sound/core.h>
42#include <sound/initval.h>
43#include <sound/compress_params.h>
44#include <sound/compress_offload.h>
45#include <sound/compress_driver.h>
46
47/* TODO:
48 * - add substream support for multiple devices in case of
49 * SND_DYNAMIC_MINORS is not used
50 * - Multiple node representation
51 * driver should be able to register multiple nodes
52 */
53
54static DEFINE_MUTEX(device_mutex);
55
56struct snd_compr_file {
57 unsigned long caps;
58 struct snd_compr_stream stream;
59};
60
61/*
62 * a note on stream states used:
63 * we use follwing states in the compressed core
64 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
65 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
66 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
67 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
68 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
69 * decoding/encoding and rendering/capturing data.
70 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
71 * by calling SNDRV_COMPRESS_DRAIN.
72 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
73 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
74 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
75 */
76static int snd_compr_open(struct inode *inode, struct file *f)
77{
78 struct snd_compr *compr;
79 struct snd_compr_file *data;
80 struct snd_compr_runtime *runtime;
81 enum snd_compr_direction dirn;
82 int maj = imajor(inode);
83 int ret;
84
81cb3246 85 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
b21c60a4 86 dirn = SND_COMPRESS_PLAYBACK;
81cb3246 87 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
b21c60a4 88 dirn = SND_COMPRESS_CAPTURE;
81cb3246 89 else
b21c60a4 90 return -EINVAL;
b21c60a4
VK		 91
92 if (maj == snd_major)
93 compr = snd_lookup_minor_data(iminor(inode),
94 SNDRV_DEVICE_TYPE_COMPRESS);
95 else
96 return -EBADFD;
97
98 if (compr == NULL) {
99 pr_err("no device data!!!\n");
100 return -ENODEV;
101 }
102
103 if (dirn != compr->direction) {
104 pr_err("this device doesn't support this direction\n");
a0830dbd 105 snd_card_unref(compr->card);
b21c60a4
VK		 106 return -EINVAL;
107 }
108
109 data = kzalloc(sizeof(*data), GFP_KERNEL);
a0830dbd
TI		 110 if (!data) {
111 snd_card_unref(compr->card);
b21c60a4 112 return -ENOMEM;
a0830dbd 113 }
b21c60a4
VK		 114 data->stream.ops = compr->ops;
115 data->stream.direction = dirn;
116 data->stream.private_data = compr->private_data;
117 data->stream.device = compr;
118 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
119 if (!runtime) {
120 kfree(data);
a0830dbd 121 snd_card_unref(compr->card);
b21c60a4
VK		 122 return -ENOMEM;
123 }
124 runtime->state = SNDRV_PCM_STATE_OPEN;
125 init_waitqueue_head(&runtime->sleep);
126 data->stream.runtime = runtime;
127 f->private_data = (void *)data;
128 mutex_lock(&compr->lock);
129 ret = compr->ops->open(&data->stream);
130 mutex_unlock(&compr->lock);
131 if (ret) {
132 kfree(runtime);
133 kfree(data);
134 }
a0830dbd
TI		 135 snd_card_unref(compr->card);
136 return 0;
b21c60a4
VK		 137}
138
139static int snd_compr_free(struct inode *inode, struct file *f)
140{
141 struct snd_compr_file *data = f->private_data;
142 data->stream.ops->free(&data->stream);
143 kfree(data->stream.runtime->buffer);
144 kfree(data->stream.runtime);
145 kfree(data);
146 return 0;
147}
148
17ac8e5c 149static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
b21c60a4
VK		 150 struct snd_compr_tstamp *tstamp)
151{
152 if (!stream->ops->pointer)
17ac8e5c 153 return -ENOTSUPP;
b21c60a4
VK		 154 stream->ops->pointer(stream, tstamp);
155 pr_debug("dsp consumed till %d total %d bytes\n",
156 tstamp->byte_offset, tstamp->copied_total);
5b1f79f7
CK		 157 if (stream->direction == SND_COMPRESS_PLAYBACK)
158 stream->runtime->total_bytes_transferred = tstamp->copied_total;
159 else
160 stream->runtime->total_bytes_available = tstamp->copied_total;
17ac8e5c 161 return 0;
b21c60a4
VK		 162}
163
164static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
165 struct snd_compr_avail *avail)
166{
17ac8e5c 167 memset(avail, 0, sizeof(*avail));
b21c60a4 168 snd_compr_update_tstamp(stream, &avail->tstamp);
17ac8e5c 169 /* Still need to return avail even if tstamp can't be filled in */
b21c60a4 170
b21c60a4 171 if (stream->runtime->total_bytes_available == 0 &&
5b1f79f7
CK		 172 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
173 stream->direction == SND_COMPRESS_PLAYBACK) {
b21c60a4
VK		 174 pr_debug("detected init and someone forgot to do a write\n");
175 return stream->runtime->buffer_size;
176 }
177 pr_debug("app wrote %lld, DSP consumed %lld\n",
178 stream->runtime->total_bytes_available,
179 stream->runtime->total_bytes_transferred);
180 if (stream->runtime->total_bytes_available ==
181 stream->runtime->total_bytes_transferred) {
5b1f79f7
CK		 182 if (stream->direction == SND_COMPRESS_PLAYBACK) {
183 pr_debug("both pointers are same, returning full avail\n");
184 return stream->runtime->buffer_size;
185 } else {
186 pr_debug("both pointers are same, returning no avail\n");
187 return 0;
188 }
b21c60a4
VK		 189 }
190
5b1f79f7
CK		 191 avail->avail = stream->runtime->total_bytes_available -
192 stream->runtime->total_bytes_transferred;
193 if (stream->direction == SND_COMPRESS_PLAYBACK)
194 avail->avail = stream->runtime->buffer_size - avail->avail;
195
4c28e32d
CK		 196 pr_debug("ret avail as %lld\n", avail->avail);
197 return avail->avail;
b21c60a4
VK		 198}
199
200static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
201{
202 struct snd_compr_avail avail;
203
204 return snd_compr_calc_avail(stream, &avail);
205}
206
207static int
208snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
209{
210 struct snd_compr_avail ioctl_avail;
211 size_t avail;
212
213 avail = snd_compr_calc_avail(stream, &ioctl_avail);
214 ioctl_avail.avail = avail;
215
216 if (copy_to_user((__u64 __user *)arg,
217 &ioctl_avail, sizeof(ioctl_avail)))
218 return -EFAULT;
219 return 0;
220}
221
222static int snd_compr_write_data(struct snd_compr_stream *stream,
223 const char __user *buf, size_t count)
224{
225 void *dstn;
226 size_t copy;
227 struct snd_compr_runtime *runtime = stream->runtime;
f0283b58
CK		 228 /* 64-bit Modulus */
229 u64 app_pointer = div64_u64(runtime->total_bytes_available,
230 runtime->buffer_size);
231 app_pointer = runtime->total_bytes_available -
232 (app_pointer * runtime->buffer_size);
b21c60a4 233
f0283b58 234 dstn = runtime->buffer + app_pointer;
b21c60a4 235 pr_debug("copying %ld at %lld\n",
f0283b58
CK		 236 (unsigned long)count, app_pointer);
237 if (count < runtime->buffer_size - app_pointer) {
b21c60a4
VK		 238 if (copy_from_user(dstn, buf, count))
239 return -EFAULT;
b21c60a4 240 } else {
f0283b58 241 copy = runtime->buffer_size - app_pointer;
b21c60a4
VK		 242 if (copy_from_user(dstn, buf, copy))
243 return -EFAULT;
244 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
245 return -EFAULT;
b21c60a4
VK		 246 }
247 /* if DSP cares, let it know data has been written */
248 if (stream->ops->ack)
249 stream->ops->ack(stream, count);
250 return count;
251}
252
253static ssize_t snd_compr_write(struct file *f, const char __user *buf,
254 size_t count, loff_t *offset)
255{
256 struct snd_compr_file *data = f->private_data;
257 struct snd_compr_stream *stream;
258 size_t avail;
259 int retval;
260
261 if (snd_BUG_ON(!data))
262 return -EFAULT;
263
264 stream = &data->stream;
265 mutex_lock(&stream->device->lock);
266 /* write is allowed when stream is running or has been steup */
267 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
268 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
269 mutex_unlock(&stream->device->lock);
270 return -EBADFD;
271 }
272
273 avail = snd_compr_get_avail(stream);
274 pr_debug("avail returned %ld\n", (unsigned long)avail);
275 /* calculate how much we can write to buffer */
276 if (avail > count)
277 avail = count;
278
4daf891c
CK		 279 if (stream->ops->copy) {
280 char __user* cbuf = (char __user*)buf;
281 retval = stream->ops->copy(stream, cbuf, avail);
282 } else {
b21c60a4 283 retval = snd_compr_write_data(stream, buf, avail);
4daf891c 284 }
b21c60a4
VK		 285 if (retval > 0)
286 stream->runtime->total_bytes_available += retval;
287
288 /* while initiating the stream, write should be called before START
289 * call, so in setup move state */
290 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
291 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
292 pr_debug("stream prepared, Houston we are good to go\n");
293 }
294
295 mutex_unlock(&stream->device->lock);
296 return retval;
297}
298
299
300static ssize_t snd_compr_read(struct file *f, char __user *buf,
301 size_t count, loff_t *offset)
302{
49bb6402
CK		 303 struct snd_compr_file *data = f->private_data;
304 struct snd_compr_stream *stream;
305 size_t avail;
306 int retval;
307
308 if (snd_BUG_ON(!data))
309 return -EFAULT;
310
311 stream = &data->stream;
312 mutex_lock(&stream->device->lock);
313
314 /* read is allowed when stream is running */
315 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
316 retval = -EBADFD;
317 goto out;
318 }
319
320 avail = snd_compr_get_avail(stream);
321 pr_debug("avail returned %ld\n", (unsigned long)avail);
322 /* calculate how much we can read from buffer */
323 if (avail > count)
324 avail = count;
325
326 if (stream->ops->copy) {
327 retval = stream->ops->copy(stream, buf, avail);
328 } else {
329 retval = -ENXIO;
330 goto out;
331 }
332 if (retval > 0)
333 stream->runtime->total_bytes_transferred += retval;
334
335out:
336 mutex_unlock(&stream->device->lock);
337 return retval;
b21c60a4
VK		 338}
339
340static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
341{
342 return -ENXIO;
343}
344
345static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
346{
347 if (stream->direction == SND_COMPRESS_PLAYBACK)
348 return POLLOUT | POLLWRNORM;
349 else
350 return POLLIN | POLLRDNORM;
351}
352
353static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
354{
355 struct snd_compr_file *data = f->private_data;
356 struct snd_compr_stream *stream;
357 size_t avail;
358 int retval = 0;
359
360 if (snd_BUG_ON(!data))
361 return -EFAULT;
362 stream = &data->stream;
363 if (snd_BUG_ON(!stream))
364 return -EFAULT;
365
366 mutex_lock(&stream->device->lock);
367 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
368 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
369 retval = -EBADFD;
370 goto out;
371 }
372 poll_wait(f, &stream->runtime->sleep, wait);
373
374 avail = snd_compr_get_avail(stream);
375 pr_debug("avail is %ld\n", (unsigned long)avail);
376 /* check if we have at least one fragment to fill */
377 switch (stream->runtime->state) {
378 case SNDRV_PCM_STATE_DRAINING:
379 /* stream has been woken up after drain is complete
380 * draining done so set stream state to stopped
381 */
382 retval = snd_compr_get_poll(stream);
383 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
384 break;
385 case SNDRV_PCM_STATE_RUNNING:
386 case SNDRV_PCM_STATE_PREPARED:
387 case SNDRV_PCM_STATE_PAUSED:
388 if (avail >= stream->runtime->fragment_size)
389 retval = snd_compr_get_poll(stream);
390 break;
391 default:
392 if (stream->direction == SND_COMPRESS_PLAYBACK)
393 retval = POLLOUT | POLLWRNORM | POLLERR;
394 else
395 retval = POLLIN | POLLRDNORM | POLLERR;
396 break;
397 }
398out:
399 mutex_unlock(&stream->device->lock);
400 return retval;
401}
402
403static int
404snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
405{
406 int retval;
407 struct snd_compr_caps caps;
408
409 if (!stream->ops->get_caps)
410 return -ENXIO;
411
412 retval = stream->ops->get_caps(stream, &caps);
413 if (retval)
414 goto out;
415 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
416 retval = -EFAULT;
417out:
418 return retval;
419}
420
421static int
422snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
423{
424 int retval;
425 struct snd_compr_codec_caps *caps;
426
427 if (!stream->ops->get_codec_caps)
428 return -ENXIO;
429
430 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
431 if (!caps)
432 return -ENOMEM;
433
434 retval = stream->ops->get_codec_caps(stream, caps);
435 if (retval)
436 goto out;
437 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
438 retval = -EFAULT;
439
440out:
441 kfree(caps);
442 return retval;
443}
444
445/* revisit this with snd_pcm_preallocate_xxx */
446static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
447 struct snd_compr_params *params)
448{
449 unsigned int buffer_size;
450 void *buffer;
451
452 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
453 if (stream->ops->copy) {
454 buffer = NULL;
455 /* if copy is defined the driver will be required to copy
456 * the data from core
457 */
458 } else {
459 buffer = kmalloc(buffer_size, GFP_KERNEL);
460 if (!buffer)
461 return -ENOMEM;
462 }
463 stream->runtime->fragment_size = params->buffer.fragment_size;
464 stream->runtime->fragments = params->buffer.fragments;
465 stream->runtime->buffer = buffer;
466 stream->runtime->buffer_size = buffer_size;
467 return 0;
468}
469
4dc040a0
VK		 470static int snd_compress_check_input(struct snd_compr_params *params)
471{
472 /* first let's check the buffer parameter's */
473 if (params->buffer.fragment_size == 0 ||
474 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
475 return -EINVAL;
476
fb4a9779
VK		 477 /* now codec parameters */
478 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
479 return -EINVAL;
480
481 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
482 return -EINVAL;
483
484 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
485 return -EINVAL;
486
4dc040a0
VK		 487 return 0;
488}
489
b21c60a4
VK		 490static int
491snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
492{
493 struct snd_compr_params *params;
494 int retval;
495
496 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
497 /*
498 * we should allow parameter change only when stream has been
499 * opened not in other cases
500 */
501 params = kmalloc(sizeof(*params), GFP_KERNEL);
502 if (!params)
503 return -ENOMEM;
769fab2a
JJ		 504 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
505 retval = -EFAULT;
506 goto out;
507 }
4dc040a0
VK		 508
509 retval = snd_compress_check_input(params);
510 if (retval)
511 goto out;
512
b21c60a4
VK		 513 retval = snd_compr_allocate_buffer(stream, params);
514 if (retval) {
769fab2a
JJ		 515 retval = -ENOMEM;
516 goto out;
b21c60a4 517 }
4dc040a0 518
b21c60a4
VK		 519 retval = stream->ops->set_params(stream, params);
520 if (retval)
521 goto out;
49bb6402 522
9727b490
JK		 523 stream->metadata_set = false;
524 stream->next_track = false;
49bb6402
CK		 525
526 if (stream->direction == SND_COMPRESS_PLAYBACK)
527 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
528 else
529 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
769fab2a 530 } else {
b21c60a4 531 return -EPERM;
769fab2a 532 }
b21c60a4
VK		 533out:
534 kfree(params);
535 return retval;
536}
537
538static int
539snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
540{
541 struct snd_codec *params;
542 int retval;
543
544 if (!stream->ops->get_params)
545 return -EBADFD;
546
547 params = kmalloc(sizeof(*params), GFP_KERNEL);
548 if (!params)
549 return -ENOMEM;
550 retval = stream->ops->get_params(stream, params);
551 if (retval)
552 goto out;
553 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
554 retval = -EFAULT;
555
556out:
557 kfree(params);
558 return retval;
559}
560
9727b490
JK		 561static int
562snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
563{
564 struct snd_compr_metadata metadata;
565 int retval;
566
567 if (!stream->ops->get_metadata)
568 return -ENXIO;
569
570 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
571 return -EFAULT;
572
573 retval = stream->ops->get_metadata(stream, &metadata);
574 if (retval != 0)
575 return retval;
576
577 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
578 return -EFAULT;
579
580 return 0;
581}
582
583static int
584snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
585{
586 struct snd_compr_metadata metadata;
587 int retval;
588
589 if (!stream->ops->set_metadata)
590 return -ENXIO;
591 /*
592 * we should allow parameter change only when stream has been
593 * opened not in other cases
594 */
595 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
596 return -EFAULT;
597
598 retval = stream->ops->set_metadata(stream, &metadata);
599 stream->metadata_set = true;
600
601 return retval;
602}
603
b21c60a4
VK		 604static inline int
605snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
606{
17ac8e5c
RF		 607 struct snd_compr_tstamp tstamp = {0};
608 int ret;
b21c60a4 609
17ac8e5c
RF		 610 ret = snd_compr_update_tstamp(stream, &tstamp);
611 if (ret == 0)
612 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
613 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
614 return ret;
b21c60a4
VK		 615}
616
617static int snd_compr_pause(struct snd_compr_stream *stream)
618{
619 int retval;
620
621 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
622 return -EPERM;
623 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 624 if (!retval)
b21c60a4 625 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 626 return retval;
627}
628
629static int snd_compr_resume(struct snd_compr_stream *stream)
630{
631 int retval;
632
633 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
634 return -EPERM;
635 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
636 if (!retval)
637 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
638 return retval;
639}
640
641static int snd_compr_start(struct snd_compr_stream *stream)
642{
643 int retval;
644
645 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
646 return -EPERM;
647 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
648 if (!retval)
649 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
650 return retval;
651}
652
653static int snd_compr_stop(struct snd_compr_stream *stream)
654{
655 int retval;
656
657 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
658 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
659 return -EPERM;
660 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
661 if (!retval) {
662 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
663 wake_up(&stream->runtime->sleep);
8b21460a
VK		 664 stream->runtime->total_bytes_available = 0;
665 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 666 }
667 return retval;
668}
669
670static int snd_compr_drain(struct snd_compr_stream *stream)
671{
672 int retval;
673
674 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
675 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
676 return -EPERM;
677 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
678 if (!retval) {
679 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
680 wake_up(&stream->runtime->sleep);
681 }
682 return retval;
683}
684
9727b490
JK		 685static int snd_compr_next_track(struct snd_compr_stream *stream)
686{
687 int retval;
688
689 /* only a running stream can transition to next track */
690 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
691 return -EPERM;
692
693 /* you can signal next track isf this is intended to be a gapless stream
694 * and current track metadata is set
695 */
696 if (stream->metadata_set == false)
697 return -EPERM;
698
699 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
700 if (retval != 0)
701 return retval;
702 stream->metadata_set = false;
703 stream->next_track = true;
704 return 0;
705}
706
707static int snd_compr_partial_drain(struct snd_compr_stream *stream)
708{
709 int retval;
710 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
711 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
712 return -EPERM;
713 /* stream can be drained only when next track has been signalled */
714 if (stream->next_track == false)
715 return -EPERM;
716
717 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
718
719 stream->next_track = false;
720 return retval;
721}
722
b21c60a4
VK		 723static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
724{
725 struct snd_compr_file *data = f->private_data;
726 struct snd_compr_stream *stream;
727 int retval = -ENOTTY;
728
729 if (snd_BUG_ON(!data))
730 return -EFAULT;
731 stream = &data->stream;
732 if (snd_BUG_ON(!stream))
733 return -EFAULT;
734 mutex_lock(&stream->device->lock);
735 switch (_IOC_NR(cmd)) {
736 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
737 put_user(SNDRV_COMPRESS_VERSION,
738 (int __user *)arg) ? -EFAULT : 0;
739 break;
740 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
741 retval = snd_compr_get_caps(stream, arg);
742 break;
743 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
744 retval = snd_compr_get_codec_caps(stream, arg);
745 break;
746 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
747 retval = snd_compr_set_params(stream, arg);
748 break;
749 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
750 retval = snd_compr_get_params(stream, arg);
751 break;
9727b490
JK		 752 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
753 retval = snd_compr_set_metadata(stream, arg);
754 break;
755 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
756 retval = snd_compr_get_metadata(stream, arg);
757 break;
b21c60a4
VK		 758 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
759 retval = snd_compr_tstamp(stream, arg);
760 break;
761 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
762 retval = snd_compr_ioctl_avail(stream, arg);
763 break;
764 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
765 retval = snd_compr_pause(stream);
766 break;
767 case _IOC_NR(SNDRV_COMPRESS_RESUME):
768 retval = snd_compr_resume(stream);
769 break;
770 case _IOC_NR(SNDRV_COMPRESS_START):
771 retval = snd_compr_start(stream);
772 break;
773 case _IOC_NR(SNDRV_COMPRESS_STOP):
774 retval = snd_compr_stop(stream);
775 break;
776 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
777 retval = snd_compr_drain(stream);
778 break;
9727b490
JK		 779 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
780 retval = snd_compr_partial_drain(stream);
781 break;
782 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
783 retval = snd_compr_next_track(stream);
784 break;
785
b21c60a4
VK		 786 }
787 mutex_unlock(&stream->device->lock);
788 return retval;
789}
790
791static const struct file_operations snd_compr_file_ops = {
792 .owner = THIS_MODULE,
793 .open = snd_compr_open,
794 .release = snd_compr_free,
795 .write = snd_compr_write,
796 .read = snd_compr_read,
797 .unlocked_ioctl = snd_compr_ioctl,
798 .mmap = snd_compr_mmap,
799 .poll = snd_compr_poll,
800};
801
802static int snd_compress_dev_register(struct snd_device *device)
803{
804 int ret = -EINVAL;
805 char str[16];
806 struct snd_compr *compr;
807
808 if (snd_BUG_ON(!device || !device->device_data))
809 return -EBADFD;
810 compr = device->device_data;
811
812 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
813 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
814 compr->direction);
815 /* register compressed device */
816 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
817 compr->device, &snd_compr_file_ops, compr, str);
818 if (ret < 0) {
819 pr_err("snd_register_device failed\n %d", ret);
820 return ret;
821 }
822 return ret;
823
824}
825
826static int snd_compress_dev_disconnect(struct snd_device *device)
827{
828 struct snd_compr *compr;
829
830 compr = device->device_data;
831 snd_unregister_device(compr->direction, compr->card, compr->device);
832 return 0;
833}
834
835/*
836 * snd_compress_new: create new compress device
837 * @card: sound card pointer
838 * @device: device number
839 * @dirn: device direction, should be of type enum snd_compr_direction
840 * @compr: compress device pointer
841 */
842int snd_compress_new(struct snd_card *card, int device,
843 int dirn, struct snd_compr *compr)
844{
845 static struct snd_device_ops ops = {
846 .dev_free = NULL,
847 .dev_register = snd_compress_dev_register,
848 .dev_disconnect = snd_compress_dev_disconnect,
849 };
850
851 compr->card = card;
852 compr->device = device;
853 compr->direction = dirn;
854 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
855}
856EXPORT_SYMBOL_GPL(snd_compress_new);
857
858static int snd_compress_add_device(struct snd_compr *device)
859{
860 int ret;
861
862 if (!device->card)
863 return -EINVAL;
864
865 /* register the card */
866 ret = snd_card_register(device->card);
867 if (ret)
868 goto out;
869 return 0;
870
871out:
872 pr_err("failed with %d\n", ret);
873 return ret;
874
875}
876
877static int snd_compress_remove_device(struct snd_compr *device)
878{
879 return snd_card_free(device->card);
880}
881
882/**
883 * snd_compress_register - register compressed device
884 *
885 * @device: compressed device to register
886 */
887int snd_compress_register(struct snd_compr *device)
888{
889 int retval;
890
891 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
892 return -EINVAL;
893
894 pr_debug("Registering compressed device %s\n", device->name);
895 if (snd_BUG_ON(!device->ops->open))
896 return -EINVAL;
897 if (snd_BUG_ON(!device->ops->free))
898 return -EINVAL;
899 if (snd_BUG_ON(!device->ops->set_params))
900 return -EINVAL;
901 if (snd_BUG_ON(!device->ops->trigger))
902 return -EINVAL;
903
904 mutex_init(&device->lock);
905
906 /* register a compressed card */
907 mutex_lock(&device_mutex);
908 retval = snd_compress_add_device(device);
909 mutex_unlock(&device_mutex);
910 return retval;
911}
912EXPORT_SYMBOL_GPL(snd_compress_register);
913
914int snd_compress_deregister(struct snd_compr *device)
915{
916 pr_debug("Removing compressed device %s\n", device->name);
917 mutex_lock(&device_mutex);
918 snd_compress_remove_device(device);
919 mutex_unlock(&device_mutex);
920 return 0;
921}
922EXPORT_SYMBOL_GPL(snd_compress_deregister);
923
924static int __init snd_compress_init(void)
925{
926 return 0;
927}
928
929static void __exit snd_compress_exit(void)
930{
931}
932
933module_init(snd_compress_init);
934module_exit(snd_compress_exit);
935
936MODULE_DESCRIPTION("ALSA Compressed offload framework");
937MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
938MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)